<template>
  <div class="login_container">
    <div class="login_box">
      <div class="avatar_box">
        <img src="../assets/logo.png">
      </div>

      <el-form ref="loginFormRef" :rules="loginFormRules" :model="loginForm" label-width="0px" class="login_form">
        <!--用户名-->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>

        <!--密码-->
        <el-form-item prop="password">
          <el-input type="password" v-model="loginForm.password" prefix-icon="iconfont icon-3702mima"></el-input>
        </el-form-item>

        <!--按钮区域-->
        <el-form-item class="btns">
           <el-button type="primary" @click="login">登录</el-button>
           <el-button type="danger" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data(){
    return {
      //这是登录表单的数据绑定对象
      loginForm:{
        username:'admin',
        password:'123456'
      },

      loginFormRules:{
        //验证用户名是否合法
        username:[
           { required: true, message: '请输入登录名称', trigger: 'blur' },
           { min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
        ],
        //验证密码是否合法
        password:[
          { required: true, message: '请输入登录名称', trigger: 'blur' },
           { min: 3, max: 8, message: '长度在 3 到 8 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    //点击按钮，重置表单
    resetLoginForm(){
      this.$refs.loginFormRef.resetFields()
    },
    login(){
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return;
        const {data:res} = await this.$http.post('login',this.loginForm);
        if(res.meta.status !== 200) return this.$message.error('登录失败');
        this.$message.success('登录成功')
        //1.将登录成功之后的token，保存到客户端sessionStorage中
        // 1.1 项目中除了登录之外的其他api接口，必须在登录之后才能访问
        // 1.2 token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
        // 2.通过编程式导航跳转到后台主页，路由地址为/home
        window.sessionStorage.setItem("token",res.data.token);
        this.$router.push('/home')
      })
    }
  },
}
</script>

<style lang="less" scoped>
    .login_container{
      background-color: #2b4b6b;
      height: 100%;
    }

    .login_box{
      width:450px;
      height:300px;
      background-color: #fff;
      border-radius:3px;
      position: absolute;
      left: 50%;
      top: 50%;
      transform: translate(-50%,-50%);

      .avatar_box{
        height: 130px;
        width:130px;
        border:1px solid blue;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px;
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        background-color: #eeeeee;
        img{
          width: 100%;
          height:100%;
          border-radius: 50%;
          background-color: grey;
        }
      }
    }

    .btns{
      display: flex;
      justify-content: flex-end;
    }

    .login_form{
      position: absolute;
      bottom:0;
      width: 100%;
      padding: 0 20px;
      box-sizing: border-box;
    }

</style>
